PhilNYC Wrote: 
> Actually, in this case it is, right?  The light has to turn on and off
> at nearly 44,100 times every second at a rate that allows for a sensor
> to accurately read and understand.  How do you make that light bulb go
> from off to full intensity and then back down to completely off?  Also
> remember that the bulb is being turned on/off by an electrical signal. 
> To do this without adding jitter is certainly very complex...

The solution to that, as has been mentioned, is to not use a bulb, you
use an LED or laser diode. My mention of a bulb was simply an example
of a device for converting electrical energy to optical (well,
photonic) energy. In reality, 44.1kHz is such a slow switching speed
for any kind of signalling (fibre optic or electrical) as to be truly
"simple" with todays technology. 

I'm not going to get into the arguments about jitter (I've had enough
of those already) but to make a statement that "electrical to optical
conversions are harder than electrical to magnetic ones" is vague and
meaningless. And to use that as a reason why a HDD is "better" than a
CD is equally absurd. First you have to define "better", and depending
on that definition you'll get a different answer.


-- 
radish
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